Micom P721, Technical Manual

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P72x/EN CM/C21 Commissioning and Maintenance
Page 6/28 MiCOM P721/P723
3.6 Auxiliary supply
Check the value of the auxiliary supply voltage (terminals 33 and 34). The value measured
shall be between 0.8 and 1.2 times the dc nominal auxiliary supply voltage, or 0.8 and 1.1
times the ac nominal auxiliary supply voltage indicated on the MiCOM P72x.
Uaux range (Volts) Uaux nominal zone (Volts)
Maximum peak value
(Volts)
24 - 60 Vdc 19 - 72 Vdc 80
48 - 250 Vdc/48 - 240 Vac 38 - 300 Vdc/38 - 264 Vac 336
24 - 250 Vdc/24 - 240 Vac 19 - 300 Vdc/19 - 264 Vac 336
3.7 Logic inputs
This test checks that all the opto-isolated inputs are functioning correctly. The P723 relays
have 5 opto-isolated inputs whereas the P721 relays have 2 opto-isolated inputs.
The opto inputs should be energized one at a time. The status of the input can be viewed
using the menu
OP. PARAMETERS > Input Status . 1 indicates an energized input and 0
indicates a de-energized input. When each logic input is energized, one of the characters on
the bottom line of the menu display changes to the value shown in the following table to
indicate the new state of the inputs.
Input MiCOM P72x models
OP. PARAMETERS/Inputs
Status cell value
Opto input 1
22-24 Terminals
P721, P723 00001
Opto input 2
26-28 Terminals
P721, P723 00010
Opto input 3
17-19 Terminals
P723 00100
Opto input 4
21-23 Terminals
P723 01000
Opto input 5
25-27 Terminals
P723 10000